Serving tray



FIG. 1 is a bottom plan view of a serving tray showing my new design;

FIG. 2 is a left side elevational view the right side being a mirror image thereof;

FIG. 3 is a top plan view;

FIG. 4 is a front elevational view the rear being a mirror image thereof; and,

FIG. 5 is left side view of the serving tray in cross section. 

The ornamental design for a serving tray, as shown and described. 